The question is a bit unrealistic with its circumstances but lets assume there is a bucket of ice cooled down to about absolute zero and is about 1000 km away (all around the sun) from sun and moving with v_0 = 1000km/sec, what will be if that all water with mass of sun reaches the sun.
UPDATE
Basically I have read about this in gizmodo http://gizmodo.com/could-the-sun-be-extinguished-by-a-bucket-of-water-just-1669914928 but did not agreed , thats why I have decided to ask about this phenomena here, hoping to find out more precise answer
Answer
This would be a highly energenic event, a gravitational collapse in combination with the initial inward velocity of 1000km/s (which is greater than the escape velocity at the surface of the sun).
There would be some type of nova event initially because the hydrogen already present in the sun would be compressed by the infalling new material, greatly enhancing fusion. Some material may be ejected and become a nebula in the nova event; rebouding energy would be a factor in addition to enhanced fusion, as in a core collapse supernova.
The water would dissociate into atomic hydrogen and oxygen.
Of the material not ejected in the nova event, the oxygen would eventually form a core at the center of a star, with lighter elements (H, He) being a shell around the core.
What happens from there depends upon the mass remaining.
If the remaining mass is less than 1.39 solar masses (the Chandrasekhar limit), the star would eventually become an inert white dwarf star, with the oxygen core being sustained by electron degeneracy pressure and unable to undergo oxygen fusion. If more than 1.39 solar mass remain, the star could become a neutron star.
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